US 12,331,205 B2
Resin particle dispersion
Takahiro Sato, Wakayama (JP); and Hirotaka Takeno, Wakayama (JP)
Assigned to KAO CORPORATION, Tokyo (JP)
Appl. No. 17/779,405
Filed by KAO CORPORATION, Tokyo (JP)
PCT Filed Nov. 16, 2020, PCT No. PCT/JP2020/042657
§ 371(c)(1), (2) Date May 24, 2022,
PCT Pub. No. WO2021/106656, PCT Pub. Date Jun. 3, 2021.
Claims priority of application No. 2019-215512 (JP), filed on Nov. 28, 2019.
Prior Publication US 2022/0403191 A1, Dec. 22, 2022
Int. Cl. C09D 11/107 (2014.01); C08F 220/18 (2006.01); C08F 220/56 (2006.01); C09D 11/037 (2014.01); C09D 11/322 (2014.01); C09D 151/00 (2006.01)
CPC C09D 11/107 (2013.01) [C08F 220/18 (2013.01); C08F 220/56 (2013.01); C09D 11/037 (2013.01); C09D 11/322 (2013.01); C09D 151/003 (2013.01); C08F 2500/27 (2021.01); C08F 2500/32 (2021.01); C08F 2800/20 (2013.01)] 19 Claims
 
1. A resin particle dispersion, comprising core/shell-type resin particles (A), a pigment, and water, wherein:
a content of the core/shell-type resin particles (A) is not less than 15% by mass in the resin particle dispersion;
a shell portion resin of the core/shell-type resin particles (A) comprises a constitutional unit derived from a (meth)acrylic acid ester (a-1) comprising a hydrocarbon group having not less than 4 and not more than 8 carbon atoms;
a core portion resin of the core/shell-type resin particles (A) comprises a constitutional unit derived from a (meth)acrylamide-based monomer (b-1) whose solubility parameter lies within the range of not less than 17.0 (J/cm3)0.5 and not more than 21.0 (J/cm3)0.5 in an amount of not less than 5% by mass;
a glass transition temperature of the core portion resin is not higher than 50° C.;
an acid value of the core portion resin is not more than 30 mgKOH/g;
an acid value of the shell portion resin is not less than 120 mgKOH/g; and
an acid value of the core/shell-type resin particles (A) is not less than 50 mgKOH/g and not more than 100 mgKOH/g.